Platform and version requirements: JS (1.0), Native (1.0)

open fun add(element: E): Boolean

Adds the specified element to the end of this list.

Return true because the list is always modified as the result of this operation.

Platform and version requirements: JVM (1.0), JS (1.0), Native (1.0)

abstract fun add(index: Int, element: E)

For JVM

Inserts an element into the list at the specified index.

This method is redeclared as abstract, because it's not implemented in the base class, so it must be always overridden in the concrete mutable collection implementation.

For JS, Native

Inserts an element into the list at the specified index.